An even broader definition of money is often needed because
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在because引导的原因状语从句里面,主语other items, 情态动词can, function在这里其实是一个动词“vi. 运行;活动;行使职责”.in effect用来修饰后面的动词function,意思是“实际上,生效”.所以谓语动词就是function.我想现在你肯定就知道怎么解析这个句子结构了吧!